Grinder



l. KOWALSKI.

GRINDER.

APPLICATION FILED !UL Y\I.19IB.

Patented May 20; 1919.

2 SHEETS-SHEET 1.

J. KOWALSKL GRINDER.

APPLICATION FILED JULY 11. 1918 Patented May 20, 1919.

2 SHEETS-SHEET 2.

I sists in securing the supporting can JOSEPH KOWALSKI, OF DETROIT, MICHIGAN.

GRINDER.

Specification of Letters Iatent.

Patented May 20, 1919.

Application filed July 17, 1918. Serial No. 245,294.

To all whom it may concern:

vBe it known that I, Josnrrr Kownnsnna citizen of Russia, and residing at Detroit, in the county of Wayne and State of Michigan, have invented a new and Improved Grinder, of which the followingisa specification.

This invention relates to means for grinding threading tools, centers and other work, and its object is to provide a grinder which can be conveniently mounted on stationary supports and accurately adjusted relative thereto.

While the drawings show this improved grinder mounted on the tail spindle of a lathe, it will be understood that it is not limited to this location. The invention consists in an electrically driven grinding wheel mounted on a slidable carriage which, in turn, is adjustable about an axis at right angles to the line of movement ofthe carriage, together with a longitudinally slidable and rotatable supporting bar extending at right angles to saidaxis; It also conbar in a. bearing which is adjustable at right angles to the bar and-is mounted on a saddle adapted to engage a cylindrical support.

In the accompanying drawings, Figure 1 a plan showing the method of mounting this improved grinder on the tail spindle of a lathe. Fig. 2 is a plan and Fig. 3 is an elevation of the grinder. Fig. 4 is a horizontal section of the saddle to support the grinder, centrally of the spindle 6f the lathe. Fig. is a section on the line 55 of Fig. 3. Fig.6 is an elevation of the carriage, motor and grinding wheel taken from the left in Fig. 3. Fig. 7 is a plan of the axis of the carriage and of 'the end of the supporting bar. Fig. 8 is a vertical section thereof disassembled. Fig. 9 is a section of the upper portion thereof on a larger scale.

Similar reference characters refer to like parts throughout the several views.

The lathe shown conventionally in Fig. 1 is provided with a head-center 1, tail center 2, tail spindle 3 and tool post at carrying the thread-cutting tool 5. 1

This improved grinder comprises a supporting bar 6, preferably round and hollow, a carriage, electric motor and grinding wheel pivotally mounted on one end of the bar, and a saddle and an adjustable post to support the bar. The saddle 7 is formed with an angular groove 8 to receive the tail spindle. A stirrup 9 is pivoted on the bolt 10 carried by the saddle .angles of the 7 and a set screw 11 mounted in this stirrup is preferably provided with a shoe 12 to engage the spindle 3 to hold the saddle in position.

The saddle has a vertical bore to receive the threaded stem 14 which is' provided with a longitudinal groove 15 to receive the end of the guide screw 16 carried by the saddle; A nut 17 on the stem rovides means for ad- ]usting the stem whlch is bored parallel to the spindle 3 to receive the bar 6. The stem is preferably provided with a saw cut 14. through to its bore and with a screw 18 which may be turned down to cause the bar 6 to be gripped firmly. By this construction, the bar 6 is always held parallel to the spindle 3. The saddle is also preferably provided with a saw cut 7 through to the bore for the stem 14 and a screw 19 is employed to cause the stem to be firmly gripped by that portion of the saddle.

A carriage guide 20 of well known construction is provided with a cylindrical extension 21 which extends into the cylindrical eye 22 on the outer end of the bar 6. "A washer 23 is positioned on means of the pin 24 and the screw 25 which screw also determines the pressure between this eye and the washer guide. The washer is preferably graduated and the eye provided with a pointer 26 to indicate the angle between carriage 27.

The carriage may be of well known construction and is moved in its. guide20 b means of the screw 28 and the handle2 One end of the carriage is provided with an apron 30 provided with a journal 31 in which the shaft 32 of the grinding orcutting wheel 33 is mounted. An electric motor 34 mounted on the carriage and its driving pulley 35 connects to the pulley 36 on the shaft 32 by means of a belt 37.

This grinder is especially adapted for sharpening thread cutting tools particularly such as are employed to cut the threads on taps. When these tools become worn, they are usually,removed from the tool post and ground, after which they must be reset which is an extremely delicate matter as great accuracy is required, for if the tool is not absolutely correctly positioned, the two faces of all the threads cut by the tap being threaded, will vary.

When using this grinder, the carriage will be swung in both directions the same this extension by and the carriage the bar 6 and the number of degrees from the position shown in Figs. 1 and '2, to grind the two faces of the thread cutting tool, and the resetting of the tool and the time lost thereby will be avoided. As the bar 6 is always parallel to the.spindle 3 which is in alinement with the cylinder from which the tap is being out, great accuracy is obtainable. The angles of the faces may be anything desired.

It will be noticed that the screw 18 may be slacked up and the bar 6 and .the parts supported thereby removed and that the bar may be secured in any other desired position, as on the tool post carriage 39, when the grinder may be employed to grind the centers 1 or for cutting of any other char acter. The details and proportions of this device may-be varied to adapt it to lathes of different sizes and for difierent classes of work without departing from the spirit of my invention as set forth in the following claims.

I claim: 7 t

1. In a grinder, the combination of a supporting bar having an eye in one end, a carriage guide provided with a cylindrical extension adapted to fit within said eye, a graduated Washer and a screw adapted to hold theextension in said eye, a carriage slidably mounted in the guide, a -motor mounted on the carriage, a grinding wheel mounted on the carriage, and means whereby the motor may drive the grinding wheel.

2. In a grinder, the combination of a supporting bar having an eye in one end, a carriage guide having a cylindrical extension rotatably mounted in the eye of said bar, a carriage slidably adjustable in said guide, and an electric motor and a cutting wheel driven thereby mounted on said carriage. 3. In a grinder, the combination of a supporting bar having an eye in one end, a car riage guide having a cylindrical extension rotatably mounted in the eye of said bar, a

carriage slidably adjustable in said guide,

an electric motor and a cutting wheel driven thereby, mounted on said carriage, a supporting stem in which the supporting bar is adjustably mounted, and a saddle to receive the stem.

4. In a grinder, the combination of a supporting bar, a carriage guide rotatably mounted on one end of said bar, a carriage slidably adjustable in said guide, an electric.

motor and a cutting wheel driven thereby, mounted on said carriage, a supporting stem in which the supporting bar is adjustably mounted, and a saddle to receive the stem, means to adjust the stem in the saddle, and means to prevent the stem from turning in the saddle.

5. In a grinder, the combination of a supporting bar, a carriage uide rotatably mounted on'one end of said bar, a carriage slidably adjustable in said guide, an electric motor and a cutting wheel driven thereby, mounted on said carriage, a supporting stem in which the supporting bar is adjustably mounted, and a saddle to receive the stem, said saddle formed with a longitudinal groove to receive a cylindrical support, means mounted on said saddle to secure it to the support, means to adjust the stem in the saddle, and means to prevent the stem from turning in the saddle and to hold the supporting bar parallel to said cylindrical support.

1 JOSEPH KOWALLSKI. 

